Billy is the 36" wide lucite single wall shelf which features polished nickel and knurled support pole hardware. Each shelf unit is 36"W and 12"deep. Lucite shelves are 3/4" thick x 36"w x 12"D. The shelves are secured to the wall with a bottom lucite support rail which is attached to the shelf as one piece. The metal knurled support arms are screwed to the wall for support with four screws which are shown on the square polished nickel base plate. The top of the support arm screws to the lucite shelf with a single screw. Minor assembly and wall mounting. We suggest a max 20 lb weight load. Materials: lucite/acrylic shelf, polished nickel finished metal hardware.